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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
in npn, one p-type region is sandwiched between two n-type regions. n-type regions have electrons as majority carriers so npn has more of electron current. whereas pnp has more of hole current. And electrons have more mobility than holes. so npn is faster in operation... so it is used more widely than pnp.
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